Sawdust-conveying attachment



P. F. GURGEL SAWDUST CONVEYING ATTACHMENT.

APPLICATION FILED MAILZE, l92l Reissued Jan. 10, 1922. 15,262.

INVENTOR Paul F Gum al BY W M ATTORNEYS.

ATENT QFFICE.

PAUL F. GURG-EL. O1 NEILLSVILLE, -WISGONS1N, ASSIG-NOR OF ONE-HALF T PETE-B HEISER, 0F ."MARSHFIELD, WISCONSIN.

SAWDUST-CONVEYING ATTACHMENT.

Specification of Reissucd Letters Patent.

Ito-issued Jan. 10, 192 2.

Original No. 1,321,031, dated November 4, 1919, Serial No. 110,223, filed July 19, 1916. Application for reissue filed March 26, 1921.

To ail whom it may concern Be it known that I, PAUL F. Goucnn, a citizen of the United States, residing at Neillsville, in the county of Clark, State of Wisconsin, have invented certain new and useful Improvements in Sawdust-Conveying Attachments; and I do hereby declare the following to be a full, clear, and exact description. of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to sawdust conveying apparatus for saw mills, and has particular reference to a pneumatic attachment in the class specified.

The primary object of the invention is to provide an improved conveying apparatus which may be attached to any saw mill, particularly portable mills, for removing the sawdust as it flies from the circular saw.

My improvement consists essentially of a hopper or trough into which the sawdust is thrown as it escapes from the saw and is blown into a conveyor conduit through which it: is conducted to the sawdust pile. By this construction, it is seldom necessary to dig a sawdust pit below the machine for catching the sawdust, the sawdust being instantaneously disposed of with each cut which the machine makes.

A further object of the invention is to construct a sawdust conveyor for. saw mills which pneumatically removes the sawdust from the saw blade, but which does not pass the sawdust through a fan, as in those devices heretofore known to me, so that the fan blades are in danger of becoming clogged from sawdust 0r bent and broken by means of knots or pieces of bark. By reason of the fact that the sawdust does not pass through the fan, the latter is permitted to run at full speed at all times, instead of being greatly reduced in speed during the cutting of a board as is the case where the sawdust must pass through the fan. As a result, the sawdust does not have a chance to clog the fan,

and the sawdust from the cut is entirely cleaned out of the conduit by-the time the carriage can be jigged back.

With the above and other objects in View,

as will hereinafter appear, my invention will be fully set forth and described, reference being had to the accompanying drawings.

In said drawings:

Serial No. 455,958.

Figure 1 is a prespective view: of the saw receiving trough, showing the relation of the lcollast opening and the sawdust receiving conuit.

Fig. 2 is a longitudinal section showing the relationship of theapparatus to a circular saw. a

Fig. 3 is a section on the line 33 of Fig. 2 looking in the direction of the arrow, the saw being divided on its vertical diameter to iigildicatc either a right or left hand cutting e ge.

Referring more particularly to the draw ings, 1 represents a circular saw of the usual type, whose lower edge is positioned just above the mouth of the trough or hopper 2. The hopper 2 may be of any suitable conformation, but preferably assumes the shape of an end of an ellipse, so that sawdust which is thrown into the rounded bottom of the trough will be induced to fly upwardly again so as to be brought into the sphere of action of the air blast. In mounting the trough or hopper below the saw blade 1, the edge of (he saw is brought into position just above the upper edge of a comparatively large circular opening 3 formed in one face of the hopper, so that sawdust which flies from the teeth A of the blade 1 will be thrown across the opening 3, in position to be intercepted by a blast of air issuing through the opening 4: formed in the opposite face of the trough 2 and in substantial registration with the opening 3. The opening 3 constitutes an outlet into a conduit section 5, which is frusto-conical in shape, thelarger end of the conduit being secured in any suitable manner around the opening 3. The shape of the conduit 5 provides a contraction in the passage through which the sawdust must go, so that the air column is slightly compressed therein and properly carries the sawdust to the sawdust pile. The opening l is provided with an external collar or sleeve 6 which provides a fitting for the connection of the blower fan 7. The fan 7 may be of any suitable type, which will throw a column of air across the trough 2 and into the conduit 5.

The top of the trough is open and the trough is unobstructed between its-sides, so that the blast of air discharged from the conduit across the trough entrains air mathin the trough drawing it in at the open top and carrying with it dust and sawdust and, the trough being unobstructed between its sides, pieces of bark and the like entering the trough do not become wedged or lodged therein but are carried into the conduit. A large amount of air is entrained owing to the discharging of the blast across the conduit, the column expanding when discharged from the blast conduit.

The trough 2 coacts at one or both sides with the extension chute 8 which catches the sawdust and directs it tothe bottom of the trough, or into the path of the blast from the blower 7 Thus substantially the whole peripheral portion of the saw, which carries and throws sawdust is brought within the limits of the sawdust conveying devices, so that in practice, substantially all oi? the sawdust is carried away from the machine, and no pit is required to catch the sawdust below the saw hanger. Ordinarily, only one of the chutes 8 is utilized, namely, that one which underhangs the cutting side of the saw. Thus, as indicated in Fig. 3, the right hand side of the figure shows a left hand mill equipment, with the teeth A operating clownwardly as shown by the arrow, while the opposite half of the figure shows the reverse arrangement. The upper end of the chute 8 is suspended from the side of the hush or saw frame, as at 10, and its lower end rests freely on the edge of the trough While it is not usually necessary to use two of the chutes, one on each side, obviously two may be readily suspended, and since the chutes are removably hung, a single chute may be readily shifted from one side to the other when the cutting direction of the saw is changed.

Inthe operation of my apparatus the lat ter is first installed by supporting the trough in any suitable manner below the saw 1 in such position that the lower edge of the saw appears on a line just above the upper edge of the opening 3. conduit or pipe of suitable material is attached to the con duit section 5 and leads to the sawdust pile at any suitable point. The blower 7 may be mounted upon the saw hanger or upon a separate stand, as suits the convenience or desires of the mill operator, and is driven by means of the pulley 9, which is belted to the main drive shaft of the saw mill or other power plant. When the tan is operated, a column of air is blown from the opening 4 across the trough 2 and into the conduit 5. When the saw passes through a timber the sawdust is thrown from the lower portion of the saw across the open ing 3 and is caught by the blast oil? the open-- ing 4 and carried through the conduit 5.

The entraining of the air within the conduit causes the air to rush with considerable force into the top of the trough carrying dust and particles of sawdust into the trough which are not forcibly discharged into the trough by the saw and from. the trough into the exhaust conduit. The contraction of the conduit causes the air passing thereto to contact with or sweep the walls of the exhaust conduit, preventing clogging of the exhaust conduit.

Having thus described my invention, what I claim as new and desire to secure by Let ters Patent, is:

1. A sawdust conveyor for circular saws comprising a trough adapted to be positioned below the saw and including flat side walls parallel with the plane of said saw, a saw dust exhaust conduit communicating with the trough through an opening in one of its side walls, an air blast conduit communi eating with the trough through an opening in the other side wall smaller than and in axial alinement with said exhaust opening whereby a column of air is directed across the trough wholly beneath the saw, and a chute underlying the working side of the saw with its bottom directed over one end of the trough on a line to intersect said column of air.

2. A sawdust conveyor for circular saws comprising a flat trough having a curved bottom adapted to be positioned beneath the saw, said trough being open at the top and unobstructed between its side walls permitting the unobstructed passage of air. and debris into and through the trough, an exhaust conduit disposed transversely of the trough and opening centrally into the trough through one side thereof below the saw, and an air blast conduit disposed transversely of the trough and delivering thereto through the other sidewall and opposite said exhaust conduit 30 that the air is discharged from the air blast conduit across the trough and into the exhaust conduit entraining air entering the unobstructed open top of the trough, the diameter of the discharge conduit being substantially greater than that of the air blast conduit.

A sawdust conveyor for circular saws comprising a flat trough adapted to be po-- sitioned. below the saw, said trough being open at the top and unobstructed between its side walls, an exhaust conduit opening intoone side or the trough centrally thereof, and a blast conduit opening into the other side of the trough opposite said exhaust conduit so that the blast of air is discharged from the blast conduit across the trough and into the exhaust conduit, out-raining air in the trough and drawing air tl'irough the open top of the unobstructed trough. around the lower edge of the saw to the exhaust conduit.

4. A sawdust conveyor tor rira-ular saws comprising a trough said trough being open at the top and unobstructed between its side Walls, an exhaust conduit opening into one side of the trough, and a hhlst conduit opening into the opposite side of the trough so that the blast of air is discharged. into the trough below the saw and into the exhaust conduit to entrain air in the trough, the trough being open at the top for the unobstructed passage of air around the lower edge of the saw and into and through the trough 10 to the exhaust conduit.

In Witness whereof, I heve hereunto set my hand and seal in the presence of two witnesses.

PAUL F. "FURGEL Witnesses: I

J. F. SoHUsTnR, ANNA HonsLY. 

